The experimental probability of randomly choosing a red ball from a bag filled with red and blue is #75%.# if there are 4 blue balls in the bag, how many red balls are there?

1 Answer
Nallasivam V
Feb 19, 2018

Number of Red balls #=12#

Explanation:

Given -

Probability of taking one red ball is #=75%=0.75#
Number of Blue balls #=4#
Number of Red balls #=?#
Probability of taking one red ball is#=#Number of Red Balls#\/#(Number of Red balls + Number of Blue balls)

Let Number of Red Balls #=x#

#0.75=x/(x+4)#
#x/(x+4)=0.75#
#x=0.75(x+4)=0.75x+3#
#x-0.75x=3#
#0.25x=3#
#x=3/0.25=12#
Number of Red balls #=12#

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